Method for intermittently preparing biodiesel from camphor tree seed kernel oil through ultrasonic reaction pot

Abstract

The invention relates to a method for intermittently preparing biodiesel from camphor tree seed kernel oil through an ultrasonic reaction pot, comprising the following steps of: adding alcohols and the camphor tree seed kernel oil to the ultrasonic reaction pot according to the mole ratio of 3:1-30:1, and adding 0.01-10 percent of catalysts to be uniformly stirred; then when heating to 20-100 DEG C, starting an ultrasonic irradiation device, and irradiating for 5-180 minutes under the ultrasonic frequency of 16-500 kHz, the ultrasonic power of 10-5000 W and the ultrasonic intensity of 1-1000 W / cm<2>; standing for sedimentation and demixing, then carrying out ordinary pressure or reduced pressure distillation on a supernatant mixture solution inside the ultrasonic reaction pot to obtain the alcohols so as to obtain camphor tree seed kernel grease; then washing the camphor tree seed kernel grease to eliminate the catalysts contained in the camphor tree seed kernel grease and a small amount of residual glycerol; and finally dewatering the camphor tree seed kernel grease containing moisture so as to prepare the biodiesel. The biodiesel has high oxidation stability and low cold filter plugging point.

Description

technical field [0001] The invention belongs to the technical field of biodiesel preparation, in particular to a method for intermittently preparing biodiesel from camphor tree seed kernel oil through an ultrasonic reaction tank. Background technique [0002] Camphor tree is an evergreen tree plant of Lauraceae, 20-30m high, mainly growing in tropical and subtropical regions. There are about 2,500 species in 45 genera in the world, and nearly 430 species in about 20 genera in my country, of which more than 355 species are endemic to my country. [0003] Camphor tree is a special product of precious wood and economic forest tree species in my country. It is known as the treasure tree in the south of the Yangtze River and spreads all over 14 provinces in my country. Camphor trees bloom from March to April every year, and camphor seeds are basically mature from October to December. A 5-year-old camphor tree can produce 2-5kg camphor seeds per year. Camphor tree seeds are com...

AI Technical Summary

Problems solved by technology

[0006] First, because the raw materials mainly contain fatty acids with long carbon chains (such as sixteen fatty acids and eight octadecanoic fatty acids), their cold filtration point is relatively high;

[0007] Second, because vegetable oil is rich in unsaturated fatty acids, it affects the oxidation stability of biodiesel;

[0008] Third, the reaction rate is too slow at low temperature and the reaction is not complete;

[0009] Fourth, a large amount of excess methanol is required for the reaction, which leads to difficulties in subsequent methanol separation and increased energy consumption

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